Another strategy is looking at multiple sites, if the information is correct information then all of the sites even though written by different sources would have the basically the same information among other things.
However if you are a teacher that want to select, suggest or use a site for your students in the classroom then there are a number of things you should look at or for before using it in the classroom such as first you have to find out what is the purpose of the site. Is it for kids? what kind of message is it sending to students? could it be used in the classroom? etc. If you are teaching a standard one class you have to make sure that the site for standard one level the information must not be too hard or to easy otherwise the child would not be interested in learning. Just like stated above one must make sure that the information is accurate information, the worst thing is giving students wrong or misleading information because it is hard for that child to unlearn that information. you should also take into consideration if the information is organized right, if it has too much information because students have short attention span and if the color, letting and background is appropriate since you don't want the child to get distracted by the unimportant things rather than the important things (information) and the list goes on. Selecting information from the internet may at first seem easy but if you want to get the most appropriate, effective information for yourself or for the classroom you would realize that it is not so easy.
Reference
Lamb, A.(2006). Building treehouses for learning: Technology in Today’s (Fourth Edition) Kansas : Vision to Action Publishing.